﻿using System;
using System.Windows;

namespace Hardcodet.Wpf.TaskbarNotification
{
  /// <summary>
  /// Helper class used by routed events of the
  /// <see cref="TaskbarIcon"/> class.
  /// </summary>
  internal static class RoutedEventHelper
  {
    #region RoutedEvent Helper Methods

    /// <summary>
    /// A static helper method to raise a routed event on a target UIElement or ContentElement.
    /// </summary>
    /// <param name="target">UIElement or ContentElement on which to raise the event</param>
    /// <param name="args">RoutedEventArgs to use when raising the event</param>
    internal static void RaiseEvent(DependencyObject target, RoutedEventArgs args)
    {
      if (target is UIElement)
      {
        (target as UIElement).RaiseEvent(args);
      }
      else if (target is ContentElement)
      {
        (target as ContentElement).RaiseEvent(args);
      }
    }

    /// <summary>
    /// A static helper method that adds a handler for a routed event 
    /// to a target UIElement or ContentElement.
    /// </summary>
    /// <param name="element">UIElement or ContentElement that listens to the event</param>
    /// <param name="routedEvent">Event that will be handled</param>
    /// <param name="handler">Event handler to be added</param>
    internal static void AddHandler(DependencyObject element, RoutedEvent routedEvent, Delegate handler)
    {
      UIElement uie = element as UIElement;
      if (uie != null)
      {
        uie.AddHandler(routedEvent, handler);
      }
      else
      {
        ContentElement ce = element as ContentElement;
        if (ce != null)
        {
          ce.AddHandler(routedEvent, handler);
        }
      }
    }

    /// <summary>
    /// A static helper method that removes a handler for a routed event 
    /// from a target UIElement or ContentElement.
    /// </summary>
    /// <param name="element">UIElement or ContentElement that listens to the event</param>
    /// <param name="routedEvent">Event that will no longer be handled</param>
    /// <param name="handler">Event handler to be removed</param>
    internal static void RemoveHandler(DependencyObject element, RoutedEvent routedEvent, Delegate handler)
    {
      UIElement uie = element as UIElement;
      if (uie != null)
      {
        uie.RemoveHandler(routedEvent, handler);
      }
      else
      {
        ContentElement ce = element as ContentElement;
        if (ce != null)
        {
          ce.RemoveHandler(routedEvent, handler);
        }
      }
    }

    #endregion
  }
}
